Rotary axial peristaltic pumps and related methods
First Claim
1. A pump finger/cam assembly for use in a finger-type peristaltic pump wherein a plurality of fingers sequentially compress and decompress a pump tube against a platen thereby causing peristaltic movement of fluid through the pump tube, said pump finger/cam assembly comprising:
- a cam having a concaved race formed therein, said cam rotating about an axis of cam rotation;
a plurality of fingers, each finger defining an aperture and including;
(i) a tube-compressing surface at one end, (ii) a roller at the other end, and (iii) a pin, each finger operable with a retraction apparatus, each retraction apparatus including a spring that includes a hooked end, the spring held in position by the pin, the hooked end of the spring (a) extending through the aperture defined in the finger and (b) configured to engage an aperture in the peristaltic pump, and wherein each retraction apparatus biases the finger toward the cam, said roller being rotatable about an axis of roller rotation; and
said roller riding rotatably within the race of the cam such that the axis of roller rotation is substantially perpendicular to the axis of cam rotation.
3 Assignments
0 Petitions
Accused Products
Abstract
Rotary axial peristaltic pumps, related methods and components. The rotary axial peristaltic pump generally comprises a platen having a platen surface, a tube positioned adjacent to the platen surface, cam that rotates about a rotational axis and has a cam surface that is spaced apart from the platen surface and a plurality of tube compressing fingers. The fingers move axially back and forth in sequence to sequentially compress segments or regions of the tube against the platen surface, thereby causing peristaltic movement of fluid through the tube. The fingers move back and forth on axes that are substantially parallel to the axis about which the cam rotates.
26 Citations
15 Claims
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1. A pump finger/cam assembly for use in a finger-type peristaltic pump wherein a plurality of fingers sequentially compress and decompress a pump tube against a platen thereby causing peristaltic movement of fluid through the pump tube, said pump finger/cam assembly comprising:
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a cam having a concaved race formed therein, said cam rotating about an axis of cam rotation; a plurality of fingers, each finger defining an aperture and including;
(i) a tube-compressing surface at one end, (ii) a roller at the other end, and (iii) a pin, each finger operable with a retraction apparatus, each retraction apparatus including a spring that includes a hooked end, the spring held in position by the pin, the hooked end of the spring (a) extending through the aperture defined in the finger and (b) configured to engage an aperture in the peristaltic pump, and wherein each retraction apparatus biases the finger toward the cam, said roller being rotatable about an axis of roller rotation; andsaid roller riding rotatably within the race of the cam such that the axis of roller rotation is substantially perpendicular to the axis of cam rotation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification